die-sinker edm which features high speed, high quality machining perfomance and high operability "zero-wear" (wear rate of less than 0.06% is defined as zero-wear) while machining with graphite electrode, "zero-wear" has ......die-sinker edm which features high speed, high quality machining perfomance and high operability "zero-wear" (wear rate of less than 0.06% is defined as zero-wear) while machining with graphite electrode, "zero-wear" has been made possible, making full advantage of high speed machining performance of graphite electrode. large reduction of machining time and human errors can be expected thanks to the reduced number of electrodes.